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  • .net3.0 中跨线程访问控件

    这两天用WPF做一个项目的UI部分时, 发现跨线程地访问了UI控件, 自然地报异常了. 当时找了半天也没在控件中找到InvokeRequired属性和Invoke方法, 郁闷之极.....最后发现在.net3.0中,这有所改变了.
    
    替代InvokeRequired的方法是DispatcherObject.CheckAccess()或DispatcherObject.VerifyAccess()方法,用于指示当前线程是否可以直接访问控件.
    
    替代Invoke的方法是DispatcherObject.Dispatcher.BeginInvoke(...)方法
    
    参考代码:
    
    
    // Uses the DispatcherObject.CheckAccess method to determine if 
    // the calling thread has access to the thread the UI object is on
    private void TryToUpdateButtonCheckAccess(object uiObject)
    {
        Button theButton = uiObject as Button;
    
        if (theButton != null)
        {
            // Checking if this thread has access to the object
            if(theButton.CheckAccess())
            {
                // This thread has access so it can update the UI thread
                UpdateButtonUI(theButton);
            }
            else
            {
                // This thread does not have access to the UI thread
                // Pushing update method on the Dispatcher of the UI thread
                theButton.Dispatcher.BeginInvoke(DispatcherPriority.Normal,
                    new UpdateUIDelegate(UpdateButtonUI), theButton);
            }
        }
    }
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  • 原文地址:https://www.cnblogs.com/happyyftk/p/3334601.html
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